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2.5D structure-based broadband wave-transparent frequency selective wave absorber

A technology of frequency selection and wave absorber, which is applied in the field of artificial metamaterials, can solve problems such as the sensitivity of incoming wave polarization, the difficulty of 3D structure processing, and the large size of structural units, so as to achieve polarization-insensitive angle stability and avoid Angle-sensitive characteristics, the effect of improving angle stability

Active Publication Date: 2021-02-05
XIDIAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 3D structure has many disadvantages such as difficult processing, high processing cost, large finished product volume and sensitivity to incoming wave polarization.
However, there is still a big gap between the relative bandwidth of 30.3% and the working bandwidth of the broadband antenna system
In addition, the cascading of multiple resonators makes the structural unit larger in size, poor in angular stability, and difficult to apply in a limited space.
[0005] With the wide application of broadband antenna systems and the urgent need for single-station and dual-station RCS reduction in broadband antenna systems, the existing frequency-selective absorbers have narrow wave-transmission bandwidths and large unit sizes. The frequency selective absorber with wave, high angular stability and polarization-insensitive wide wave-transmission band (S21 is less than -1dB) is used in broadband radar antenna systems with stealth requirements, but it has not yet been realized to meet the stealth requirements of broadband antenna systems frequency selective absorber

Method used

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  • 2.5D structure-based broadband wave-transparent frequency selective wave absorber
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Embodiment 1

[0028] Low scattering characteristics are an essential feature of advanced weapons and equipment. With the wide application of radar detection technology and multi-station radar, conventional stealth radome can only reduce the single-station RCS and cannot meet the stealth requirements of weapons and equipment. However, conventional absorbers do not have selectivity in the frequency domain, which seriously affects the working requirements of the antenna system for transmitting and receiving electromagnetic waves. Therefore, frequency-selective absorbers with frequency-selective characteristics have become a research hotspot in the field of stealth. However, in the prior art, the high-transmission bandwidth of the frequency-selective absorber is often narrow, which is contrary to the development trend of the broadband work of the airborne radar antenna system. Therefore, there are objective applications for the frequency-selective absorber with wide wave-transmission characterist...

Embodiment 2

[0034] The overall composition of the broadband wave-transparent frequency-selective absorber based on the 2.5D structure is the same as in Embodiment 1. In the present invention, the side length of the dielectric plate of the loss layer is a, 5mm≤a≤10mm, and the size of the dielectric plate is related to the wave-transparent work of the resonator. Frequency is related, the operating frequency of the resonator (that is, the center frequency of the wave-transmitting band of the present invention) is related to the 2.5D bent metal strip structure formed by bending the double-sided rounded metal patch along a right-angle path, when the length and width of the dielectric plate change , the 2.5D bent metal strip structure formed by bending the bilateral rounded metal patch along the right angle can also change accordingly.

[0035] The thickness of the lossy layer dielectric plate in the present invention is hd1, 0.25mm≤hd1≤2mm. The dielectric constant is j, 1.5≤j≤4.5. In this exa...

Embodiment 3

[0037] The overall composition of the broadband wave-transparent frequency-selective absorber based on the 2.5D structure is the same as in Embodiment 1. In the present invention, the side length of the dielectric plate of the loss layer is a, 5mm≤a≤10mm, and the size of the dielectric plate is related to the wave-transparent work of the resonator. Frequency is related, the operating frequency of the resonator (that is, the center frequency of the wave-transmitting band of the present invention) is related to the 2.5D bent metal strip structure formed by bending the double-sided rounded metal patch along a right-angle path, when the length and width of the dielectric plate change , the 2.5D bent metal strip structure formed by bending the bilateral rounded metal patch along the right angle can also change accordingly. In this example, side length a=10mm, thickness hd1=2mm, j=4.5.

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Abstract

The invention relates to a 2.5D structure-based broadband wave-transparent frequency selective wave absorber, and solves the problem of narrow wave-transparent bandwidth of the existing frequency selective wave absorber. A loss layer, a lossless layer and an air layer form a frequency selective wave absorber, resonators which are periodically arranged are printed on the loss layer, and each resonator subunit rotates by 90 degrees, 180 degrees and 270 degrees along the center of a dielectric plate to be positioned by taking 0 degree as a reference direction; each subunit is internally providedwith short and long single-side fillets, a double-side fillet and a rectangular metal patch which are equal in width; and a 2.5D bent metal strip formed by the same bilateral rounded metal patches which are alternately distributed on the upper layer and the lower layer of the dielectric plate along a right-angle bending path is printed between the long unilateral rounded metal patch and the shortunilateral rounded metal patch. A right-angle bent metal strip structure is formed by utilizing a 2.5D structure, the wave-transparent bandwidth of the frequency selective wave absorber is broadened,the characteristics of wide wave-transparent band, bilateral wave absorption, polarization insensitivity, angle stability and small unit size are realized, and the 2.5D structure-based broadband wave-transparent frequency selective wave absorber is suitable for a broadband antenna system with stealth requirements.

Description

technical field [0001] The invention belongs to the technical field of artificial metamaterials, and relates to a frequency selective absorber, specifically a broadband wave-transparent frequency selective absorber based on a 2.5D structure, which can be used in radar antennas, communication antennas and many other broadband applications with low scattering requirements. antenna system. Background technique [0002] Low scattering characteristics are one of the important evaluation indicators in the design of modern weapon equipment. The frequency-selective surface radome with bandpass characteristics has wave-transmitting characteristics in the working frequency band of the antenna, so as to ensure that the radiation characteristics of the antenna system are not affected. In the non-working frequency band of the antenna, this type of radome can reflect the incoming wave to other non-threatening directions, effectively reducing the single-site radar cross section (RCS) of t...

Claims

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Application Information

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IPC IPC(8): H01Q17/00H01Q15/00
CPCH01Q15/0013H01Q15/0086H01Q17/008
Inventor 姜文杨泽芊刘鹏葛江诚洪涛孙红兵李小秋
Owner XIDIAN UNIV
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